Grep Error Var Log Messages
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Linux /var/log/messages
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How To Check Logs In Linux Server
up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to grep top most frequent error messages in a unix logfile up vote 5 down vote favorite 1 If I have a file example apache log file How to extract the top most frequent error messages in a unix linux log files explained log file with no timestamps the key is most frequent error message should come on top of the list linux shell grep webserver share|improve this question edited May 22 '14 at 19:18 Vldb.User 71 asked Oct 23 '13 at 5:22 Jaya William 76124 migrated from serverfault.com Oct 23 '13 at 22:04 This question came from our site for system and network administrators. 1 grep message logfile | sort | uniq -c | sort -n | head –MadHatter Oct 23 '13 at 5:45 Sorry, head should read tail. –MadHatter Oct 23 '13 at 5:58 Thanks for the edit, more clearly defining the question; Ursadon has answered it for you, so could you please accept his or her answer so we can stop this question popping up again? As you will gather by the slowly-accumulating downvotes, this question is arguably off-topic for SF. –MadHatter Oct 23 '13 at 7:27 add a comment| 2 Answers 2 active oldest votes up vote 10 down vote cat /tmp/file: ERROR 1 1234 ERROR 2 1234 ERROR 3 1234 ERROR 4 1234 ERROR 4 1234 ERROR 3 1234 ERROR 2 1234 E
know where the log files are located, and what is contained in each and every log file.
Linux Log Command
When your systems are running smoothly, take some time to learn
Grep Log File For String
and understand the content of various log files, which will help you when there is a crisis and grep /var/log/messages you have to look though the log files to identify the issue. /etc/rsyslog.conf controls what goes inside some of the log files. For example, following is the entry http://unix.stackexchange.com/questions/97341/how-to-grep-top-most-frequent-error-messages-in-a-unix-logfile in rsyslog.conf for /var/log/messages. $ grep "/var/log/messages" /etc/rsyslog.conf *.info;mail.none;authpriv.none;cron.none /var/log/messages In the above output, *.info indicates that all logs with type INFO will be logged. mail.none,authpriv.none,cron.none indicates that those error messages should not be logged into the /var/log/messages file. You can also specify *.none, which indicates that none of the log messages will be logged. The following are http://www.thegeekstuff.com/2011/08/linux-var-log-files/ the 20 different log files that are located under /var/log/ directory. Some of these log files are distribution specific. For example, you'll see dpkg.log on Debian based systems (for example, on Ubuntu). /var/log/messages - Contains global system messages, including the messages that are logged during system startup. There are several things that are logged in /var/log/messages including mail, cron, daemon, kern, auth, etc. /var/log/dmesg - Contains kernel ring buffer information. When the system boots up, it prints number of messages on the screen that displays information about the hardware devices that the kernel detects during boot process. These messages are available in kernel ring buffer and whenever the new message comes the old message gets overwritten. You can also view the content of this file using the dmesg command. /var/log/auth.log - Contains system authorization information, including user logins and authentication machinsm that were used. /var/log/boot.log - Contains information that are logged when the system boots /var/log/daemon.log - Contains information logged by the various background daemons that runs on the system /var/log/dpkg.log
2007 last updated September 26, 2007 in CentOS, Debian Linux, Gentoo Linux, Howto, RedHat/Fedora Linux, Suse Linux, Sys admin, Troubleshooting, UNIXSo how do you find an alert or warning words in a log file http://www.cyberciti.biz/tips/find-alert-warning-error-messages-in-logfile.html over text based session? Simply use old good grep command. Usually I recommend http://www.cyberciti.biz/faq/linux-log-files-location-and-how-do-i-view-logs-files/ searching following words => fail => denied => segfault => segmentation => rejected => oops => warn
Find an alert or warning words from log filesYou need to use grep command: grep {search-word} /path/to/log/fileFind out all segfault error from /var/log/messages file, enter the following command as privileged user: # grep -i segfault /var/log/messages how to Output:Sep 23 12:20:09 node10 kernel: mutt[8896]: segfault at 0000000000000010 rip 0000000000439d5e rsp 00007fff36a30040 error 6 Sep 24 12:20:10 node10 kernel: mutt[20107]: segfault at 0000000000000010 rip 0000000000439d5e rsp 00007fffd99dbac0 error 6 Sep 25 12:20:09 node10 kernel: mutt[19734]: segfault at 0000000000000010 rip 0000000000439d5e rsp 00007fff5d807290 error 6Look like node10's mutt command generated segfault error while sending daily reports attachment via email.GUI ToolsSystem Log Viewer is a graphical, menu-driven viewer how to check that you can use to view and monitor your system logs. System Log Viewer comes with a few functions that can help you manage your logs, including a calendar, log monitor and log statistics display.Redhat / CentOS toolRedhat (RHEL) Linux offers gui tool called Log Viewer. Type the redhat-logviewer command at a shell prompt or use GUI menus to start the same. You can set filter words (alter words) by clicking on Edit > Preferences menu > Alter tab > Add buttonDebian / Ubuntu toolDebian / Ubuntu Linux also offers GUI tool to view and search log files by setting filters. Click on Applications menu > Choose System Tools > Admin > System Log. Share this on:TwitterFacebookGoogle+Download PDF version Found an error/typo on this page?About the author: Vivek Gite is a seasoned sysadmin and a trainer for the Linux/Unix & shell scripting. Follow him on Twitter. OR read more like this:Troubleshooting Lighttpd Chrooted RedHat PHP Version 5.1.6-20.el5_2.1Quick tip: Easily find strings with grep color highlighting featureSending Email With Attachments From Unix / Linux Command [ Shell Prompt ]Linux x86_64: Detecting Hardware ErrorsLinux: Finding and Locating files with find command part # 1How To Use vi as D2014 in Commands, File system, LinuxI am a new Linux user. I would like to know where are the log files located under Debian/Ubuntu or CentOS/RHEL/Fedora Linux server? How do I open or view log files on Linux operating systems? Almost all logfiles are located under /var/log directory and its sub-directories on Linux. You can change to this directory using the cd command. You need be the root user to view or access log files on Linux or Unix like operating systems. You can use the following commands to see the log files:less commandmore commandcat commandgrep commandtail commandzcat commandzgrep commandzmore commandHow do I view log files on Linux?Open the Terminal or login as root user using ssh command. Go to /var/log directory using the following cd command: # cd /var/log
To list files use the following ls command: # ls Sample outputs from RHEL 6.x server:anaconda.ifcfg.log boot.log-20111225 cron-20131110.gz maillog-20111218 messages-20131103.gz secure-20131027.gz spooler-20131117.gz up2date-20131117.gz anaconda.log btmp cron-20131117.gz maillog-20111225 messages-20131110.gz secure-20131103.gz squid uptrack.log anaconda.program.log btmp-20120101 cups maillog-20120101 messages-20131117.gz secure-20131110.gz swinstall.d uptrack.log.1 anaconda.storage.log btmp-20131101.gz dkms_autoinstaller maillog-20131027.gz mysqld.log secure-20131117.gz tallylog uptrack.log.2 anaconda.syslog collectl dmesg maillog-20131103.gz ntpstats setroubleshoot UcliEvt.log varnish anaconda.yum.log ConsoleKit dmesg.old maillog-20131110.gz prelink spooler up2date wtmp arcconfig.xml cron dracut.log maillog-20131117.gz rhsm spooler-20111211 up2date-20111211 yum.log atop cron-20111211 dracut.log-20120101 messages sa spooler-20111218 up2date-20111218 yum.log-20120101 audit cron-20111218 dracut.log-20130101.gz messages-20111211 secure spooler-20111225 up2date-20111225 yum.log-20130101.gz boot.log cron-20111225 httpd messages-20111218 secure-20111211 spooler-20120101 up2date-20120101 boot.log-20111204 cron-20120101 lastlog messages-20111225 secure-20111218 spooler-20131027.gz up2date-20131027.gz boot.log-20111211 cron-20131027.gz maillog messages-20120101 secure-20111225 spooler-20131103.gz up2date-2013110